Retention of pyridine-14C and other 14C-labelled amines by Illinois No. 6 coal

✍ Scribed by Clair J. Collins; Edward W. Hagaman; Richard M. Jones; Vernon F. Raaen

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 254 KB
• Volume: 60
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(81)90207-6

✦ Synopsis

When Illinois No. 6 whole coal or vitrain is extracted with pyridine14C, the extracts and solid residues retain 12-20% and 9-l 6%, respectively (at temperatures of 23 and 130°C) of the pyridine-14C. Repeated treatment of the extracts with benzene, followed by filtration and drying at 0.1 Pa for 48 h removes only 20-25% of the labelled amine, although 92-98% of the latter is exchangeable with unlabelled pyridine. The solid residues exhibit similar behaviour. Tetrahydroquinoline-'4C (THQ-14C) was used to extract Illinois No. 6 vitrain at 270°C; the soluble and insoluble fractions after exhaustive drying retained 18% and 15%. respectively, of the THQ-14C which could not be exchanged (from the soluble fraction) with a mixture of unlabelled THQ and quinoline. Ethylenediamine-14C (EDA-14C) was also used to extract Illinois No. 6 vitrain. The retention of EDA-14C was temperature-dependent (10% retained in 20 h at 12O"C, followed by 1 h at 150°C). Following three exchanges with unlabelled EDA, all but 2.6% of the EDA-14C was removed.